Switch devenv from development branch to v0.6.3

Broke in #16019. This would have been caught if someone ran 'devenv up' during manual testing of that PR, or better yet, if we had CI for the nix developer environment. Switch back to the latest release version, which doesn't have the upstream issue: cachix/devenv#756
matrix-org · Aug 4, 2023 · 27efb8a · 27efb8a
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diff --git a/flake.lock b/flake.lock
diff --git a/flake.nix b/flake.nix
@@ -45,7 +45,7 @@
     # Output a development shell for x86_64/aarch64 Linux/Darwin (MacOS).
     systems.url = "github:nix-systems/default";
     # A development environment manager built on Nix. See https://devenv.sh.
-    devenv.url = "github:cachix/devenv/main";
+    devenv.url = "github:cachix/devenv/v0.6.3";
     # Rust toolchain.
     rust-overlay.url = "github:oxalica/rust-overlay";
   };